Additional Fan on Hyper 212+

I also need to ask about that. How do you tell which side pulls and which side pushes on the fan

Typically, there is anarrow somewhere on the shroud showing direction of airflow. If you can't find that, look at the logo on the fan blade hub; if it's facing you the wind would be in your face...

Best answer selected by samuelspark.

Also, on a fan there will be four struts from the centre to the edge,
if you plug the fan in and hold this side facing you, you will feel the breeze,
alternatively, see the side with the blades and spinning bit in the middle, if that is visible from the outside of the case, then that fan is blowing into the case,
does that clear it for you?
my explanations are sometimes a little vague to 'normal' people hehe
Moto